Patek Philippe Calatrava 3418

Brand Patek Philippe, Geneva Year circa 1957 Reference 3418 A N (Noir or black) (1st series) Movement No. 727 978 Calibre 12-400, manual-winding, 18 jewels Case No. 2 605 818 (by Jean Vallon, Canton of Neuchâtel) Material/s stainless steel Bracelet integrated convertible stainless steel bracelet Buckle stainless steel clasp Dimensions Ø 34.2 mm. Thickness 9.2 mm. Signature dial, case and movement Accessories Extract from the Archives Patek Philippe Ref. 3418 A N (Noir or black) (1st series), thin water-resistant case, without lugs, black ‘tropical’ dial, ultra-thin indexes, stainless steel integrated but convertible bracelet; nicknamed ‘Convertible’ by collectors; stainless steel -- A water-resistant thin wristwatch, with integrated but convertible bracelet -- Stainless steel, manual-winding, round-shaped, thin gentleman’s wristwatch, with subsidiary seconds at 6 o’clock, water-resistant, with stainless steel integrated but convertible bracelet. -- Case: two-piece, polished, cylindrical case-band with frustoconical low part extended by a wide flat inclined bezel, without lugs, water-resistant with screwed flat case-back and additional screwed steel ring; polished ‘Calatrava’ crown. Stainless steel integrated but convertible bracelet ‘à petites mailles’ and ‘belt-buckle’ clasp (made by Cornu & Cie, La Chaux-de-Fonds). Dial: black colour, ‘tropical’, with stainless steel applied radiating ultra-thin indexes, external minute track divided five by five with grey-white painted radiating lines; aluminium ‘Bâton’ hands. Movement: calibre 12-400 AM, manual-winding, 18 jewels, rhodium-plated with ‘fausses côtes’ decoration, going barrel, straight-line lever escapement, Glucydur screw-balance, self-compensating Breguet hairspring, polished steel index-regulator with spring and micrometric screw, adjusted to heat, cold, isochronism and 5 positions, Geneva Quality Hallmark (“Poinçon de Genève” / Geneva Seal). Movement stamped ‘HOX’, the American importer’s code for Patek Philippe, indicating that this watch was retailed on the US market. -- The Extract from the Archives, dated May 14, 2019, mentions that this watch was made in 1957 and sold on April 30, 1959.